What is meant by concentric circle?

In the adjoining figure $O$ is the centre of the circle.

$m\left(\mathrm{arc} DB\right)=m\angle$ _____ $\left(DOB/AOD\right)$.

In the given figure, identify the concentric circles and determine their properties. Explain how you arrived at your conclusion.

If $m\stackrel{⏜}{QR}$ is $k°$, find the value of $k$.

The difference between the circumferences of two concentric circles is $132 \mathrm{cm}$ and the radius of smaller circle is $14 \mathrm{cm}.$ Find the radius of larger circle. [Take $\mathrm{\pi }=\frac{22}{7}$]

In the adjoining figure $\mathrm{O}$ is the centre of the circle.

Major arcs are $:$ arc $\mathrm{PAB}$, arc $\mathrm{PDQ}$ and arc _____. $\left(XDB/PBD/DBQ/ADQ\right)$

If a line intersects two concentric circles (circles with the same centre) with centre $O$ at $\mathrm{A}, \mathrm{B}, \mathrm{C}$ and $\mathrm{D},$ prove that $\mathrm{A}\mathrm{B}=\mathrm{C}\mathrm{D}.$

In the given figure, identify the non concentric circles.

Identify the figure that consists of concentric circles from figures $A,B,C$

In the given figure, chord $AB$ and $CD$ of a circle intersect externally at $P$. If $AB =$$6$ cm, $CD = 3$ cm and $PD =$ $5$ cm, then $PB =$?

In the adjoining figure $\mathrm{O}$ is the centre of the circle. $\angle$_____ is the central angle subtended by the arc $\stackrel{⏜}{DB}$. $\left(AOD/ DOB/ AOB\right)$

Two concentric circle of radius 3 cm and 4 cm, intersect in

Concentric circles can have different centres.

Priyanka finds this piece of a circular disc in her grandma’s trunk.

She wants to find the diameter of the disc.

What could Priyanka do to find the diameter of the disk?